Bicolored typewriter-ribbon



s.f A. NEmrCH..

Patented Ja. 4, 1921.

cee?,

' stices of the ribbon material and to a PATENT oFFicE.

SAMUEL A. NEIDICH, 0F BURLINGTON, NEW JERSEY.

BICOLORED TYPEWRITER-RIBBON.

Specification of Letters Patent.

Patented Jan. 4, 1.921.

Application led August 4, 1919; Serial No. 315,176.

To all whom t may concern:

Be it known that I, SAMUEL A..NEIDICH,

a citizen of the United States, residing in Burlington,- New Jersey, have invented Bi` colored Typewriter-Ribbons, of which the.

followingis a specification. i y

This invention relates to the manufacture of typewriter ribbon or similar ink bearing thereof, from one side to the other is eliminated.

When inks comprising insoluble pigment colors in a non-drying oil are employed in the manufacture 'of bi-colored typewriter ribbon and thelike, there is no tendency for the colors to interfuse, or run together, since the coloring material is present in the voil body cf the `ink merelydin the form of suspension and is deposited vupon the material of the ribbon. But it has been ascertained that fattyl acid solutions of anilin color bases, when added to' said pigment inks, greatly increase the density, intensity -and durability of the inks, and when inks of differing color containingthe said fatty acid solutions of anilin color bases are placed side by` side upon the sameribbon, as is the case with the inks of bi-colored typewriter ribbon, there is a prompt and rapid .transfer of portions of the highly dyed oil from each side to the other, resulting in partial or complete destruction ofthe brighter color by the darker, especially at or near the original line of demarcation between the colors. This 'transfusion is diie no doubt tojcapillary attraction in the intercertain extent to osmosis.

It is common knowledge that certain alkalis have the effect of saponifying the fatty acids, and furthermore, it has been discovered that when an alkali-such as carbonate of soda, caustic soda, o r the like, is brought into contact with inks such as those described containing a fatty acid solution of anilin or similar coloring matter, there results a neutralization of the acidity, with the saponilication of the fatty acid and the conversion ofthe coloring matter back to its base or solid form. In accordance with these well-known facts I have discovered that by introducing an alkali into the formula of one ofthe inks of a bi-colored typewriter ribbon, I am able to prevent the transfusion of the dyed oils from an ad- Joiniiig ink and am thus enabled to employ inks. containing the strengthening element of the fatty acid solution of anilin color basis in conjunction with other inks upon bi-color typewriter ribbon and the like with" no interfusion of the colors.

In forming an ink having the desiredA alkaline reaction, I have found it desirable to employ as my non-drying oil base a thin mineral oil such as petiolatum oil, to which I add suitable coloring matter together with an' alkaline substance, such as soda ash. An

ink having these or similar constituents,

invention, I may employ as a blue ink, a

non-drying oil, such as castor or peanut, or a mixture of several non-drying oils, into which the so-called iron blue, (Prussian, Milori, or similar colors) is ground until the color is in the finest possible degree of subdivision, and to this may be added an oleic acid solution of Victoria blue base. It is understood that the iron blue exists in the ink simply in suspension, whereas the oleic or Victoria. blue base is in solution and has the effect of dyeing the oil itself in which the pigment color is suspended. As a red ink I may employ a body comprising petrolaturn oil, lithol red, and soda ash all present'in proportions of 3 to 2 to 1 by side to the cotton tape constituting the vbody of the typewriter ribbon in the usual manner, all transfusion to the red portion of the ribbon of the blue dyed oil being prevented by' the alkaline action of the soda parts respectively. These inks I apply side of the ribbon in perspective, 2, indicating Y a portion of the ribbon to which the blue has been applied and, 3, the portion of the ribbon carrying the red ink.

My invention has a particularly valuable application to ribbons employing differing inks of which one is used to a lesser extent than the other, as is the case generally; for example, with the red and blue bi-colored ribbons in which the red side of the tape is used less often than th blue side. In a case Such as this, the ink which is mainly used may be fortified by the addition of the fatty acid solution of a suitable coloring matter such as the Victoria blue base, and the two sides of the ribbon may, in spite of unequal usage, thus be'made to. last substantially equal lengths of time.

It will, of course, be understood that by the term typewriter ribbon, appearing both in description and claims, I include all ink bearing ribbon or the like employed in a manner similar to the ink bearing ribbons in typewriters; and I desirevit to be understood further that my invention is not confined to any specific constituents entering the composition of the inks employed. lVhat I claim as my invention 1s:

l. A typewriter ribbon having differing inks upon adjoining portions thereof, one of said inks comprising a substance for preventing the transfusion thereto of said adjoining ink.

2. A typewriter ribbon having differing inks upon adjoiningy portions thereof, one

of said inks comprising soluble coloring matter, and said adjoining ink comprising a substance capable of throwing said coloring matter out of solution.

3'. A typewriter ribbon having differing inks upon adjoining` portions thereof, one of said inks comprising a solution of coloring matter in oil, and said adjoining ink comprising a substance capable of saponifying said oil.

4. A typewriter ribbon having differing inks upon adjoining portions thereof, one of said inks comprising a fatty' acid, and said adjoining ink comprisingan alkali.

5. A typewriter ribbon havin adjoining portions thereof inked with di ering inks, one of said inks comprising a fatty acid, and said adjoining ink comprising soda ash.

6. A typewriter ribbon having adjoining portions thereof inked with differing inks, one of said inks comprising a fatty acid, and said adjoining ink comprising a thin mineral oil and soda ash.

7 A typewriter ribbon having adjoining portions thereof inked with inks of differing color, one of said inks comprising an oleic acid solution of an anilin color base, and said adjoining ink comprising a thin mineral oil, a pigment color, and soda ash.

SAMUEL A. NEIDICH. 

